Neutrinoless Double Beta Decay of 76Ge. Preliminary Results of an Experiment in the Frejus Tunnel

  • A. Morales
  • J. Morales
  • R. Nuñez-Lagos
  • J. Puimedón
  • J. A. Villar
  • D. Dassie
  • Ph. Hubert
  • F. Leccia
  • P. Mennrath
  • M. M. Villard
  • J. Chevallier
  • B. Haas
Conference paper

Abstract

As is well known the detection of the neutrinoless double beta decay of nuclei — would indicate the violation of lepton number and would provide significant info mation about the character, possible mass and chirality couplings of the neutrino. Several direct experiments aiming to detect such a rare event have been recently carried out or are being done. We present here the preliminary results of an — attempt to search for the neutrinoless double beta decay of 7 6Ge, currently being done in the Frejus tunnel. The experiment (which uses as source and detector an — assembly of 4 Germanium crystal [1]) investigates the transition from the ground state 0+ of the 7 6Ge to the ground state 0+ of 7 6Se, as well as to the excited sta te 2+ (559.1 KeV), of 7 6Se, looking for a gaussian shaped peak at E=2040.7 KeV in the anticoincidence spectrum, and at E=1481.6 KeV in the coincidence spectrum 2β/γ (Eγ=559.1 KeV), respectively, by surrounding the 4-Ge detector with a 4π — assembly of NaI scintillators. Transition to the 0<Stack><Subscript>2</Subscript><Superscript>+</Superscript></Stack> (1122.3 KeV) excited state is also investigated.

Keywords

Quartz Europe Hexagonal Iodi Assure 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    E. Fiorini et al: Nuovo Cimento, 13A (1973) 747ADSGoogle Scholar
  2. 2.
    Ph. Hubert et al: “α-rays induced background in ultra low level counting with Ge spectrometers”, submitted to Nucl. Instr. & Meth., Jun 1986Google Scholar
  3. 3.
    D.O. Caldwell et al: Phys. Rev. Lett. 54 (1985) 281ADSCrossRefGoogle Scholar
  4. 4.
    H. Ejiri et al: Nucl. Phys. A448 (1986) 271ADSGoogle Scholar
  5. 5.
    J.A. Villar: “Métodos de simulación en experiencias de muy bajas actividades”. Thesis Univ. of Zaragoza. Publ. FAN/UZ, Jun 1985Google Scholar
  6. 6.
    W.R. Nelson, H. Hirayama, D.W.O. Rogers: “The EGS4 Code System”. SLAC Report 265 (Dec 1985)Google Scholar
  7. 7.
    M. Doi, T. Kotani, E. Takasugi: Progr. of Theor. Phys., Japan, Suppl. 83, (1985)Google Scholar
  8. 8.
    O. Helene: Nucl. Instr. & Meth. 212 (1983) 319CrossRefGoogle Scholar
  9. 9.
    F.T. Avignone et al: Phys. Rev. Lett. 54 (1985) 2039Google Scholar
  10. 10.
    F.T. Avignone: private communicationGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1986

Authors and Affiliations

  • A. Morales
    • 1
  • J. Morales
    • 1
  • R. Nuñez-Lagos
    • 1
  • J. Puimedón
    • 1
  • J. A. Villar
    • 1
  • D. Dassie
    • 2
  • Ph. Hubert
    • 2
  • F. Leccia
    • 2
  • P. Mennrath
    • 2
  • M. M. Villard
    • 2
  • J. Chevallier
    • 3
  • B. Haas
    • 3
  1. 1.Departamento de Fisica NuclearUniversidad de ZaragozaFrance
  2. 2.Centre d’Etudes Nucléaires de Bordeaux-GradignanUniversité de Bordeaux IF-BordeauxFrance
  3. 3.Centre de Recherches Nucléaires de StrasbourgF-StrasbourgFrance

Personalised recommendations